Chain pipe-wrench.



PATENTED JUNE 30, 1908.

G. AMBORN. CHAIN PIPE WRENCH.

APPLIOATION FILED MAY 6. 1907.

q INVENTOR WITNESSES:

By A zflomeys,

THE NORRIS PETERS Cm, wAsmNnrorl. o. c.

UNITED STATES PATENT OFFIOE.

GEORGE AMBORN, OF NEW YORK, N. Y., ASSIGNOR TO J. H. WILLIAMS & 00., OFBROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

CHAIN PIPE-WRENCH.

Specification of Letters Patent.

Patented June 30, 1908.

Application filed May 6, 1907. Serial No. 372,035.

' To all whom it may concern:

Be it known that I, GEORGE AMBoRN, a citizen of the United States,residing in the borough of Brooklyn, county of Kings, city and State ofNew York, have invented certain new and useful Improvements in ChainPipe-Wrenches, of which the following is a specification.

This invention relates to chain wrenches and similar devices and aims toprovide certain improvements therein.

In the type of wrench to which my invention is particularly directed, ajaw or jaws are provided in connection with a chain which is pivoted orotherwise secured thereto, the wrench being provided with means forlocking the free end of the chain after the latter has been passedaround the pipe.

The present invention comprises certain improvements in such lockingmeans.

In the drawings which illustrate one form of my invention, Figure 1 isan elevation of a wrench provided with my improved locking means, thewrench being shown as applied to a pipe; Fig. 2 is an elevation similarto Fig. 1 showing the parts in a dili'erent position; Fig. 3 is a top orplan view of the wrench; Fig. 4 is an elevation of the inner side of oneof the jaws.

In the drawings I have shown my invention as applied to a constructionof wrench having two laterally separated jaws A, A connected to asuitable handle B and between which the chain O is pivoted so that itmay swing to either side of the wrench, so that either of the workingfaces a or a of the wrench may be brought into operation. As shown, thechain is pivoted to the jaws by a bolt 1) extending through the jaws andthe end of the handle, the latter being slotted at c toreceive the firstlink or eye d of the chain. In wrenches of this construction locks areusually provided on each side af the wrench, and the chain is usuallyengaged with the lock which is on the opposite side to the pipe. In theform of lock heretofare commonly employed it has been found that thechain has been liable to slip out of engagement with the look under someof the conditions of use. This disengagement is especially apt to happenwhen the wrench is used on the under side of the pipe, so that the lockwhich is engaged by the chain is on the under side of the Wrench. Underthese conditions the length of chain at the rear of the lock drops to avertical osition and tends to throw the lock ing pintle out ofengagement with the lock, especially when the wrench is given a returnstroke to obtain a fresh grip on the pipe, during which time the strainupon the chain is relieved. According to the present invention I providea lock which is adapted to pre vent such disengagement and to maintainthe parts in the locked position in all of the ordinary conditions ofuse.

The construction of my improved lock is best shown in Fig. 4, whichillustrates one side of the lock, this side being duplicated on theopposite jaw. As shown, the lock comprises an abutment D which ispreferably formed on the forward part of the aw, such abutment beingadapted to engage one of the pintles of the chain, and to bear all ofthe strains of use. At the rear of the abutment D I provide a forwardlyturned hook shaped retaining member E, the forward end 6 of which isturned inwardly so as to provide a recess f to receive the pintle whichis next adjacent to that engaged by the abutment D. In engaging thechain with the lock it is necessary to first bring the rear pintle inengage ment with the retaining member E, where upon the forward pintleautomatically falls into place behind the abutment D. To 161- mit thismovement the rear side of the a utment should extend at such an anglethat the pintle may engage it by a lateral movement, or a swingingmovement around the rear pintle as a center. I have found in practicethat such abutment may be inclined forwardly to a certain extent andstill hold the chain against all ofthe strains of use.

When the wrench is in use as illustrated in Fig. 1, it will be seen thatthe direct pull of the chain is borne by the abutment D. When the wrenchis in use on the under side of the pipe as indicated in Fig. 2, theforward pintle on the return stroke of the wrench may move outwardlysulliciently to be disengaged from the abutment D, but under thesecircumstances, the rearward pintle is securely held in the recess f ofthe retaining member E. This not only prevents the complete es cape ofthe chain, but so holds the latter that on the next 0 erative stroke ofthe wrench the forward pintle automatically returns to its lockedposition behind the abutment. The unused length of chain back of theretaining member has no effect to tend to disengage the parts.

It will be understood that while I have illustrated my invention asapplied to a wrench having a double jaw and a centrally pivoted chain,that it is applicable to other constructions of chain wrench and also toother devices of similar character. It will also be understood thatinstead of employing a chain having locking intles, I may substituteother forms of 100 ring means without departing from the invention.Other chains of a like character may also be used.

What I claim is 1. In a chain wrench or the like, a chain having lockingfaces, a locking means for the free end of the chain comprising anabutment adapted to be engaged by such locking faces, the rear side ofsaid abutment extending at an angle sufficient to hold said chain inuse, but permitting the free engagement of the chain therewith by alateral movement of the chain, and means independent of said abutmentfor preventing disengagement of the free end thereof when the chain ison the under side of the wrench and released from said abutment.

2. In a chain wrench or the like, a chain having locking faces, alocking means for the free end of the chain comprising an abutmentadapted to be engaged by such locking faces, the rear side of saidabutment extending at an angle suflicient to hold said chain in use, butpermitting the free engagement of the chain therewith by a lateralmovement of the chain, and means for holding the chain independently ofsuch abutment, such means comprising a hook-shaped retaining memberspaced apart from said abutment sufficiently to engage the succeedinglocking face of the chain, said hook shaped member being adapted to holdthe chain when on the under side of the wrench and released from saidabutment.

3. In a chain wrench or the like, a chain having locking faces, alocking means for the free end of the chain comprising an abutmentadapted to be engaged by such locking faces, the rear side of saidabutment extending at an angle sufi icient to hold said chain in 1 4. Ina chain wrench or the like, a chain having locking faces, a lockingmeans for the free end of the chain comprising an abutment adapted to beengaged by such locking faces, the rear side of said abutment extendingat an angle suflicient to hold said chain in use, but permitting thefree engagement of the chain therewith by a lateral movement of thechain, and means for holding the chain independently of such abutment,such means comprising a forwardly projecting hookshaped member spacedapart from said abutment sufficiently to engage the succeeding lockingface of the chain.

5. In a chain wrench or the like having its working face formed in twoparts with an intervening space between them adapted to receive a chain,a chain having locking faces, a locking means for the free end of thechain, such locking means lying on the opposite side to said workingface whereby the chain is locked on the side opposite to the work, saidlocking means comprising a forwardly projecting hook-shaped member andmeans for holding said chain in engagement with such member when thechain is under a stress in a forward direction.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

GEORGE AMBORN. WVitnesses:

EUGENE V. MYERS, THEODORE T. SNELL.

